Google Translation:
While the MacBook is charging, electric current flows through its aluminum body.
Not static electricity, but a continuous and regular electric current passes through the user's body.
Even if the grounding and electrical infrastructure is faulty in the regions where the products are used,
The MacBook body should not conduct electricity.
You have bigger issues than the Apple laptop if you have faulty electricity. If the electrical issue is within your house or apartment, then you need to have that electrical issue fixed. That electrical issue is affecting every one of your electronic devices and can be very dangerous to both your devices and to you as well. An improperly wired electrical system can be extremely dangerous, so this goes beyond your Apple laptop.
You can try using a grounded AC Cord with the Apple power adapter which should stop the tingling feeling you get when using the laptop with the power adapter, but it is only masking the bigger issue of the electrical issues in the home. Does your region support a three prong AC cord (the third prong is the grounding pin)? Here is a link to the Apple grounded AC Cord (aka Power Extension Cable) for the US region....just change the region to see if you have a similar grounded cable with three prongs available:
Power Adapter Extension Cable - Apple
FYI, if you use an ungrounded AC Cord with a non-Apple laptop, then you will still have the same problem if you touch any metal on it, but most other laptops are made out of plastic which would insulate you from that tingling effect.
If you are connecting other external devices to the laptop which have their own power supply, then you need to make sure they are connected to the same electrical circuit to minimize problems especially if you know the home electrical wiring has issues.
Keep in mind about the old saying.... put Garbage In, you get Garbage Out.....this applies to electricity here as well.
Of course you can always have Apple or an Apple Authorized Service Provider examine your laptop, power adapter, and charging cable to make sure they are safe & working properly, but you already seem to know that your home has electrical wiring issues.
